tinymce.PluginManager.add('placeholder', function(editor) {
  editor.on('init', function() {
      let label = new Label;

      onBlur();

      tinymce.DOM.bind(label.el, 'click', onFocus);
      editor.on('focus', onFocus);
      editor.on('blur', onBlur);
      editor.on('change', onBlur);
      editor.on('setContent', onBlur);
      editor.on('keydown', onKeydown);

      function onFocus() {
          if (!editor.settings.readonly === true) {
              label.hide();
          }
          editor.execCommand('mceFocus', false);
      }

      function onBlur() {
          if (editor.getContent() == '') {
              label.show();
          } else {
              label.hide();
          }
      }

      function onKeydown(){
          label.hide();
      }
  });

  let Label = function(){
      let placeholder_text = editor.getElement().getAttribute("placeholder") || editor.settings.placeholder;
      let placeholder_attrs = editor.settings.placeholder_attrs || {style: {position: 'absolute', top:'5px', left:0, color: '#888', padding: '1%', width:'98%', overflow: 'hidden', 'white-space': 'pre-wrap'} };
      let contentAreaContainer = editor.getContentAreaContainer();

      tinymce.DOM.setStyle(contentAreaContainer, 'position', 'relative');

      // Create label el
      this.el = tinymce.DOM.add( contentAreaContainer, editor.settings.placeholder_tag || "label", placeholder_attrs, placeholder_text );
  }

  Label.prototype.hide = function(){
      tinymce.DOM.setStyle( this.el, 'display', 'none' );
  }

  Label.prototype.show = function(){
      tinymce.DOM.setStyle( this.el, 'display', '' );
  }
});